‖n. pl. [ NL., fr. Gr. di- = di`s- twice + &unr_; part. ] (Zool.) (a) A division of Coleoptera, having two joints to the tarsi. (b) A division of the Hemiptera, including the aphids. [ 1913 Webster ]

n. (Zool.) One of the Dimera. [ 1913 Webster ]